Chapter 16 - Acid-Base Equilibria - Exercises - Page 717: 16.19a

Answer

Work Step by Step

When the ion acts like an Acid, it gives one proton to water:
$H{SO_3}^-(aq) + H_2O(l) --> {SO_3}^{2-}(aq) + H_3O^+(aq)$
When the ion acts like a Base, it receives one proton from water:
$H{SO_3}^-(aq) + H_2O(l) --> H_2{SO_3}(aq) + OH^{-}(aq)$